Btrfs: remove batch plug in run_scheduled_IO
Block layer has a limit on plug, ie. BLK_MAX_REQUEST_COUNT == 16, so we don't gain benefits by batching 64 bios here. Signed-off-by: NLiu Bo <bo.li.liu@oracle.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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